Allow decimal fractions with non-empty parts before and after '.' in music

Allow decimal fractions with non-empty parts before and after '.' in music

This permits writing things like

mkMove = #(define-music-function
        (parser location x y)
        ( number? number? )
        #{ \once \override TextScript #'extra-offset = #(cons x y)
        #})

{
	\mkMove 4.4 -3.3
	c1^"XY"
}

Since integers are accepted in this kind of usage, not accepting
floating point numbers appears inconsistent.

While in INITIAL mode like inside of layout blocks, real numbers can
be written like 4. or -.3 for historic reasons, permitting this inside
of music could easily lead to confusion with durations or
articulations, so those spellings remain invalid in music modes.

[dak, 2013-07-22 17:58:58]

Can't allow in chordmode because of c:13.11^3.7

[janek, 2013-08-18 14:00:28]

WOW!! I've just found this patch and this is awesome!!
In my eyes, this single patch made LilyPond 2 times more user-friendly.

I think that this is totally worth of an entry in "changes" - i would be soooooo
sorry if i hadn't found this change by accident today.  Would you like to write
one or shall i do this?

thanks!!
Janek

[janek, 2013-08-19 11:07:19]

2013/8/18  <janek.lilypond@gmail.com>:
> WOW!! I've just found this patch and this is awesome!!
> In my eyes, this single patch made LilyPond 2 times more user-friendly.
>
> I think that this is totally worth of an entry in "changes" - i would be
> soooooo sorry if i hadn't found this change by accident today.  Would
> you like to write one or shall i do this?

http://code.google.com/p/lilypond/issues/detail?id=3506
and also
http://lilypondblog.org/2013/08/lilypond-became-more-user-friendly-overnight/
:)

best,
Janek